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| Author(s): |
Mônica Yamada
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Saúde Pública (FSP/CIR) |
| Defense date: | 2013-05-13 |
| Examining board members: |
Marcelo Macedo Rogero;
Neuza Mariko Aymoto Hassimotto;
Thomas Prates Ong
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| Advisor: | Marcelo Macedo Rogero |
| Abstract | |
Introduction - High-fat diet is one of the main causes of obesity, inducing significant metabolic changes, such as increased fat mass, dyslipidemia and insulin resistance. Furthermore, obesity is associated with a chronic state of low-grade inflammation in white adipose tissue, which is characterized by activation of inflammatory pathways, like nuclear factor kappa B (NF-kB) pathway, implicated in the transcription of many genes with pro-inflammatory action, such as tumor necrosis factor (TNF)-alpha and monocyte chemotatic protein (MCP)-1. Yerba mate (Ilex paraguariensis) contains bioactive compounds, such as chlorogenic acid, quercetin and kaempferol that have the ability to modulate genes envolved in inflammatory response. Objective - To investigate the effect of yerba mate aqueous extract consumption on metabolic parameters and on inflammatory response in white adipose tissue of high-fat diet-fed rats. Material and methods - Male Wistar rats were submitted a control or a high-fat diet for 12 weeks. After this period, 12 rats of each group were euthanized, constituting the baseline groups. The remainder animals were distributed into four groups, which received by intragastric gavage the yerba mate aqueous extract or vehicle (1 g/kg body weight/day) for four weeks and then, all animals were euthanized. Oral glucose and intraperitoneal insulin tolerance tests were performed at 12 and 16 weeks of experimental protocol. Blood glucose, insulin, lipid profile and inflammatory markers were measured. Water, lipid, protein and ash content were analyzed by carcass chemical composition. Periepididymal adipose tissue were employed to evaluate key proteins involved in inflammatory and insulin signaling pathway by Western blot, and adipokines gene expression by real time PCR. Results - High-fat diet induced body adiposity, dyslipidemia, glucose intolerance and systemic inflammation. In periepididymal fat, high-fat diet decreased AKT phosphorylation in rats acutelly stimulated with insulin. The consumption of yerba mate aqueous extract for four weeks reduced body weight gain and improved lipid profile in high-fat diet group compared to non-treated group. However, yerba mate did not repair others dysfunctions induced by high-fat feeding. Conclusion - High-fat feeding produced some metabolic dysfunctions, but did not induce chronic inflammation in periepididymal adipose tissue. On the other hand, the yerba mate aqueous extract consumption reduced body weight gain and improved lipid profile of rats fed a high-fat diet (AU) | |
| FAPESP's process: | 10/14164-7 - Effect of yerba mate (Ilex paraguariensis) aqueous extract on the expression of proteins involved in inflammatory response of the white adipose tissue from rats fed with a high fat diet |
| Grantee: | Monica Yamada |
| Support Opportunities: | Scholarships in Brazil - Master |